Chrissy Teigen is known for being open and honest, and talking about her life after having adorable baby Luna is no exception. The supermodel, who welcomed Luna in April with husband John Legend, tells Elle Australia that she’s developed new curves since she gave birth—and she’s learning to embrace them.

“I always felt like a bit of a tomboy, and I never looked at my body as particularly sexual—I wasn’t a curvy girl,” she says. “But to be able to see my body afterward, and of course you get, like, hips. Finally, for the first time, I feel like I have a bit more of a womanly figure.”

However, that’s created a few challenges in the wardrobe department, and Teigen's had to buy a lot of new clothes. “I only shop online, basically,” she says. “Whatever my stylist Monica Rose puts me in, I order it in every color, in usually two different sizes because I fluctuate.”

As for actual sizes, Beth Warren, R.D.N., founder of Beth Warren Nutrition and author of Living a Real Life with Real Food, tells SELF that it can be normal to fluctuate regularly between two different numbers, especially if your lower size tends to fit tighter and your bigger size is looser (and keep in mind that clothing sizes aren't the same across brands, anyway).

Some postpartum women like Teigen can also go up and down in weight, Sherry Ross, M.D., an ob/gyn and women's health expert at Providence Saint John’s Health Center in Santa Monica, California, tells SELF. "In the first six to nine months, there are a lot of inconsistencies—[you may be breastfeeding], not exercising as much as before, stressed, and you tend to eat more," she says. "There is a group of women who battle with bigger weight fluctuations [than just a few pounds] during this time." Since chances are you can't just purchase multiples of new clothing items like Teigen, to avoid winding up with a closet of clothes that don't fit, Ross recommends that postpartum women don't buy a ton of new items they hope to wear for a long time until they hit nine months, when fluctuations tend to level off, or buy ones with stretch.

While it’s possible to have a body that’s just in-between sizes, Matheny says there are a few reasons why you might fluctuate if you haven't just had a baby (beyond the obvious, like yo-yo dieting). Those include hormonal changes, your salt intake (having a lot of salt can make you bloated due to water retention), digestive changes, and your level of hydration (you can weigh significantly less if you’re dehydrated).

It’s also possible that you’re just not pooping enough. Matheny says that if you’re not having regular bowel movements (usually that means at least one a day, but you know what’s considered normal for you), then it’s a good idea to try to take in more fluids, move more throughout the day, and have more fiber in your diet.

You shouldn’t freak out if you discover that you tend to flip-flop between sizes, but if it happens a lot and it bothers you, Warren says it’s a good idea to look into why. If you find that you’re fluctuating up and down by five pounds or more, Warren recommends taking a closer look at your daily diet. One helpful tactic is keeping a food log for a week (or at least three days if that’s a bit much), including one weekend day. “Take a look at the types of foods you are eating and when you are eating them, and think about how you felt before and after,” she says. “After checking in with yourself, you can revaluate what you are doing when it comes to eating and decide what areas you can change.”

If you’re constantly bloating or experiencing issues with certain foods, Matheny says it’s a good idea to talk to your doctor. There’s a chance you may have an underlying condition or food allergy.